Abstract
Some absorption effects of high-frequency sound waves in a single crystal of yttrium iron garnet (YIG) are described. Two absorption bands as a function of temperature have been observed and are attributed to a dissipative motion of domain walls within the YIG. The domain walls initially pinned and rendered immobile by crystalline dislocations are released under thermal excitation. Other resonancelike absorptions as a function of magnetic field are seen and are consistent with ferroacoustic resonance. These resonances are shown to vary in strength in a way proportional to the absolute temperature squared and sound frequency cubed.
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